[issue23605] Use the new os.scandir() function in os.walk()

[STINNER Victor]

STINNER Victor added the comment:

>> Are you testing the top-bottom or bottom-up?
> My benchmark.py calls os.walk() with topdown=True, which is the default.

Is it worth to mention in the os.walk() doc that topdown=False can be faster?

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<http://bugs.python.org/issue23605>
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